Feeding America, the nation's largest charitable hunger-relief organization, provides these statistics on the effects of hunger.
In the United States:

In 2013, 49.1 (15.8%) million or 1 in 6 people lived in food-insecure households compared to 49.0 million (15.9%) in 2012.

In 2013, 17.5 million (14.3%) or 1 in 7 households were food insecure compared to 17.6 million (14.5%) in 2012.

Very low food security among all households remained essentially unchanged, declining to 5.6% of all households, from 5.7% in 2012.

In 2013, 15.8 million (21.4%) children were living in food-insecure households compared to 15.9 million (21.6%) in 2012. In 2013, 7.5 million (19.5%) households with children were food insecure, slightly lower than the number of households in 2012 (20.0% of households with children).